Competitive Linearity for Envelope Tracking: Dual-Band Crest Factor Reduction and 2D-Vector-Switched Digital Predistortion

As wireless communication standards evolve to support ever-higher data rates, the required linearity and bandwidth must increase, which leads to higher energy consumption [1]. The problem of high energy consumption has become more serious due to the wide-spread adoption of orthogonal frequency-division multiplexing (OFDM), which is used in long-term evolution (LTE) and Wi-Fi applications [2]. The low energy efficiency of OFDM-based systems results from the statistical distribution of OFDM signals, combined with the efficiency characteristics of power amplifiers (PAs).